JP4177122B2 - Cutting board and manufacturing method thereof - Google Patents

Description

【００３３】
【発明の効果】
本発明により提供されるポリエチレン製まな板は、１００℃以上の高温殺菌・滅菌処理を行っても反りやゆがみ等の熱変形が発生しにくく、また、従来のポリエチレン製まな板と同様の切れ味と使用感が得られる。
【００３４】
特に、表皮層のＬＤＰＥ含有量を６０〜９０質量％とすることにより、優れた切れ味と使用感が失われずに、表面に適度な硬さと耐熱溶融性がさらに付与されるので、ササクレ等の表面損傷や高温殺菌・滅菌処理時の熱溶融を防ぐことができる。
【００３５】
本発明のまな板は、高温殺菌・滅菌処理に対応できる耐熱性を有し、優れた切れ味と柔らかい感触により長時間使用した場合の疲労感が少なく、しかも、適度な硬さにより耐久性もあるので、特に業務用まな板として適している。
【００３６】
また、本発明により提供される上記まな板の製造方法は、中間層の両面に表皮層を効率良く積層することができる。しかも、中間層のＨＤＰＥ及び／又はＬＬＤＰＥの含有量を９０質量％以下とすることにより、押出ラミネーションを行う際の不良品発生が少ない。従って、生産性が高い。
【図面の簡単な説明】
【図１】本発明に係るまな板の一例についての模式的断面である。
【図２】加熱反りの評価試験に用いる治具の構成を説明する図である。
【図３】熱溶融の評価試験に用いる治具の構成を説明する図である。
【符号の説明】
１…中間層
２（２ａ、２ｂ）…表皮層
３…試料
４…加熱反り評価の治具
５…熱溶融評価の治具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting board for cooking, and relates to an improvement of a cutting board used in a home, a school, a school, a nursery school, a restaurant industry, and the like.
[0002]
[Prior art]
Conventionally, a cutting board made of synthetic resin such as wood or polyethylene has been widely used as a cutting board for cooking. Both general household chopping boards and chopping boards for business use in the food service industry, school, school, nursery school, etc. are used for cooking all ingredients such as meat, vegetables, fish, etc.・ Sterilization treatment is necessary.
[0003]
Conventionally, chemical sterilization has been the mainstream, but recently there has been a shift to high-temperature sterilization due to recent measures against O-157, and the need for a cutting board that can withstand high temperatures such as hot air or hot water has increased.
[0004]
However, conventional cutting boards made of low-density polyethylene cannot withstand high temperatures and are warped and deformed, such as distortion, which hinders use. In order to solve the deformation at the time of high temperature sterilization and sterilization, there is a commercially available anti-deformation cutting board with built-in wood as a synthetic resin core material, but it is caused by warping or water intrusion due to peeling of the adhesive part due to high temperature sterilization and sterilization. There were defects such as mold. In addition, there is a drawback that a large number of man-hours are required for processing.
[0005]
In addition, a low-density polyethylene cutting board is easily cut into shallow cuts by a kitchen knife, causing crusting, fluffing, and shaving, which causes food contamination and surface dents. A sheet cutting board made of polypropylene that is harder than low-density polyethylene is commercially available, but the feeling of use is poor because the blade edge of the kitchen knife hits the hard surface of the polypropylene sheet, and it causes fatigue when working time is prolonged. Especially, it is unsuitable as a cutting board for business use, and is mainly limited to outdoor use.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a polyethylene cutting board that does not undergo deformation such as warpage during high-temperature sterilization and sterilization, and that has a good feeling in use, and a method for producing the same.
[0007]
The cutting board provided by the present invention is made of a polyethylene resin containing 60 to 90% by mass of low density polyethylene (LDPE) on both sides of an intermediate layer made of a polyethylene resin containing 10 to 90% by mass of high density polyethylene (HDPE). The ratio of the thickness (t) of each skin layer to the total thickness (T) of the skin layer laminated on both sides of the intermediate layer is 0.1 ≦ t / T ≦ It is characterized by 0.3 .
[0008]
By using an intermediate layer made of polyethylene resin with a total HDPE content of 10 to 90% by weight as the core of the cutting board, thermal deformation such as warping and distortion is less likely to occur even after high-temperature sterilization and sterilization treatment. The sharpness and feeling of use similar to that of a polyethylene cutting board can be obtained.
[0009]
When the skin layer is formed of a polyethylene resin containing 60 to 90% by mass of LDPE, an excellent hardness and heat resistance are further imparted to the surface without losing excellent sharpness and feeling of use. It can prevent surface damage such as cherry blossoms and heat melting during high temperature sterilization and sterilization.
[0010]
When the ratio of the thickness (t) of the individual skin layer to the total thickness (T) of the cutting board is 0.1 ≦ t / T ≦ 0.3, the skin layer is excellent in heat resistance. The effect of preventing melting at the time of treatment is high, and the heat resistance of the intermediate layer is excellent, so that the effect of preventing thermal deformation during high-temperature sterilization / sterilization treatment is high.
[0011]
In the method for producing a cutting board provided by the present invention, a skin layer made of a polyethylene resin containing 60 to 90% by mass of LDPE is coextruded on both surfaces of an intermediate layer made of polyethylene resin containing 10 to 90% by mass of HDPE. It is characterized by laminating by an extrusion lamination method. According to this method, the skin layer can be efficiently laminated on both surfaces of the intermediate layer.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 schematically shows a cross section of an example (101) of a cutting board according to the present invention. The cutting board 101 has a multilayer structure in which the skin layer 2 (the first skin layer 2a and the second skin layer 2b) is laminated on both surfaces of the intermediate layer 1. The size, thickness, shape and the like of the cutting board 101 may be the same as those of the conventional cutting board, but are not particularly limited.
[0013]
The intermediate layer 1 and the skin layers 2a and 2b are both made of polyethylene resin. In the present invention, the polyethylene resin is one of low density polyethylene (hereinafter referred to as “LDPE”), linear low density polyethylene (hereinafter referred to as “LLDPE”), or high density polyethylene (hereinafter referred to as “HDPE”). It is the single or mixed polyethylene containing the above, and may contain other components, such as resin other than polyethylene, an antibacterial agent, and a coloring agent, as long as the object of the present invention is not violated. LDPE usually has a density of about 0.91 to 0.94 (unit: g / cm ² ), LLDPE usually has a density of about 0.91 to 0.94, and HDPE usually has a density of 0.94 to 0.97. The density is about.
[0014]
The mid layer 1 is formed of a polyethylene resin containing 10 to 90% by mass of HDPE and / or LLDPE. By using an intermediate layer made of polyethylene resin having a total of HDPE and / or LLDPE of 10 to 90% by mass as the core material of the cutting board, heat resistance that does not cause deformation in high temperature sterilization / sterilization treatment can be obtained.
[0015]
In order to improve the effect of suppressing thermal deformation during high-temperature sterilization / sterilization treatment, the blending amount of HDPE and / or LLDPE is preferably 30% by mass or more, and more preferably 50% by mass or more. preferable. Moreover, it is particularly preferable to use HDPE rather than LLDPE.
[0016]
When the HDPE and / or LLDPE in the intermediate layer is less than 10% by mass and the blending amount of LDPE increases, the effect of suppressing thermal deformation during high-temperature sterilization / sterilization treatment is insufficient. On the other hand, when the content exceeds 90% by mass, the moldability of the polyethylene resin is deteriorated when the cutting board is manufactured, and the warpage of the molded product is easily generated during the extrusion molding, so that the productivity is lowered.
[0017]
The skin layer 2 is formed of a polyethylene resin containing LDPE. By forming the skin layer with a polyethylene resin containing LDPE, the same sharpness and feeling of use as a conventional polyethylene cutting board can be obtained. That is, since the cutting edge of the knife is easy to bite into the cutting board surface, an excellent sharpness is obtained, and the feeling that the cutting edge of the knife touches the cutting board surface is soft, so that an excellent usability is obtained. Therefore, even when used for a long time, there is little fatigue.
[0018]
The blending amount of LDPE in the polyethylene resin forming the skin layer is preferably 60 to 90% by mass . When the blending amount of LDPE in the skin layer is 60 to 90% by mass , the hardness increases slightly compared to the skin layer of only LDPE, and the surface becomes difficult to be scratched, so that there are less crusting, fluffing, shaving, etc. . In addition, since the heat resistance of the skin layer is improved, it prevents melting of the surface even when exposed to a high-temperature heat source or in contact with surrounding metal members heated to a high temperature during high-temperature sterilization and sterilization. be able to. Furthermore, if it is the range of the blending amount of LDPE, the skin layer has an appropriate softness, so that excellent sharpness and feeling of use are not lost.
[0019]
If the LDPE in the skin layer is less than 60% by mass and the blending amount of HDPE and / or LLDPE increases, the cutting board surface becomes too hard, so that the sharpness is lowered and the feeling of use is lowered. It is easy to come and blade spilling easily occurs. On the other hand, when the content exceeds 90% by mass, the same sharpness and feeling of use as a conventional polyethylene cutting board can be obtained, but the effect of imparting appropriate hardness and heat-resistant melting property by HDPE and / or LLDPE is sufficient. I can't get it.
[0020]
The ratio of the thickness t of individual skin layers to the total thickness T of the cutting board is 0.1 ≦ t / T ≦ 0.3 (in FIG. 1, 0.1 ≦ ta / T ≦ 0.3, 0.1 ≦ tb / T ≦ 0.3). It is preferable that there is 0.15 ≦ t / T ≦ 0.25. By setting 0.1 ≦ t / T, the heat resistance of the skin layer is improved, and the effect of preventing melting during high-temperature sterilization / sterilization treatment is enhanced. On the other hand, by setting t / T ≦ 0.3, the heat resistance of the intermediate layer is improved, and the effect of preventing thermal deformation during high-temperature sterilization / sterilization is enhanced.
[0021]
The cutting board of the present invention can be produced by a general extrusion lamination method. As a method of efficiently laminating the skin layers 2a and 2b on both surfaces of the intermediate layer 1 in the extrusion lamination method, (1) 10 to 90% by mass of HDPE and / or LLDPE for forming the intermediate layer 1 Co-extrusion lamination method in which polyethylene resin containing and polyethylene resin containing LDPE for forming skin layers 2a and 2b on both sides of the intermediate layer are simultaneously extruded in a molten state, or (2) containing LDPE Continuous sheets for the skin layer 2a and the skin layer 2b made of polyethylene resin are supplied to the laminator, and HDPE and / or LLDPE for forming the intermediate layer 1 is 10 to 90 between the two continuous sheets. An extrusion lamination method in which a polyethylene resin containing mass% is extruded in a molten state is preferable.
[0022]
【Example】
1. Manufacture of cutting board About each Example and comparative example, the polyethylene resin for intermediate | middle layers and the polyethylene resin for skin layers of both surfaces consist of polyethylene substantially, and are the composition shown in Table 1.
[0023]
The sheet of each skin layer was supplied to a laminator, and each intermediate layer resin was extruded and laminated, and cut after cooling. The temperature setting conditions of the extruder were cylinder 1: 150 ° C., cylinder 2: 155 ° C., cylinder 3: 160 ° C., cylinder 4: 165 ° C., and cylinder 5: 170 ° C. in order from the resin supply side.
[0024]
Through the above steps, a polyethylene cutting board having a total thickness of 20 mm, a short side of 300 mm, a long side of 600 mm, an intermediate layer thickness of 12 mm, and a thickness of each skin layer of 4 mm was produced.
[0025]
2. Evaluation Method A cutting board (size: 20 mm × 300 mm × 600 mm) produced in each example and comparative example was used as a sample, and the following items were evaluated. The evaluation results are shown in Table 1 together with the composition of the polyethylene resin and the ratio of the thickness of the skin layer to the total thickness (t / T).
[0026]
(1) Heat warping As shown in FIG. 2, the sample 3 is leaned against the jig 4 having a bar 4a at a height of 20 cm from the bottom at an angle of 80 degrees, and in that state, a specified temperature (100 ° C. or 110 ° C. ) Set in a heated air oven and heated for 1 hour, then turn off the oven and let it cool naturally. It takes out after cooling, measures curvature degree S (unit: mm), and visually determines according to the following reference | standard.
[0027]
<Evaluation criteria for warpage>
A: S ≦ 2
○: 2 <S ≦ 10
Δ: 10 <S ≦ 20
×: 20 <S
[0028]
(2) Thermal melting of the surface As shown in FIG. 3, a metal load jig 5 having four spherical legs with a short side of 90 mm × long side of 100 mm, 550 g and a tip of 5 mm in diameter is placed on the sample 3, In that state, the sample is placed in an air oven set at a specified temperature (100 ° C. or 110 ° C.), taken out after heating for 1 hour, and the molten state of the surface of the sample contacted with the foot of the metal jig is visually determined according to the following criteria.
[0029]
<Evaluation criteria for thermal melting>
○: No change in the surface condition △: Slight traces of the legs of the metal load jig are generated ×: Significant dents are generated by the legs of the metal load jig [0030]
(3) The surface of the sample is struck randomly 700 times with a hand-held Chinese knife, and the occurrence of the sample is visually determined according to the following criteria.
[0031]
<Evaluation criteria for Sasacre>
○: Better than the comparative example Δ: The state of the occurrence of the sacrificial of the comparative example having a skin layer made only of LDPE [0032]
[Table 1]

[0033]
【The invention's effect】
The polyethylene cutting board provided by the present invention is less susceptible to thermal deformation such as warping and distortion even after high-temperature sterilization and sterilization at 100 ° C. or higher, and has the same sharpness and feel as a conventional polyethylene cutting board. Is obtained.
[0034]
In particular, by setting the LDPE content of the skin layer to 60 to 90% by mass , the surface is further provided with appropriate hardness and heat-resistant meltability without losing excellent sharpness and feeling of use. It can prevent damage and heat melting during high temperature sterilization and sterilization.
[0035]
The cutting board of the present invention has heat resistance that can be applied to high temperature sterilization and sterilization treatment, has a low feeling of fatigue when used for a long time due to excellent sharpness and soft touch, and also has durability due to moderate hardness Especially suitable as a professional cutting board.
[0036]
Moreover, the manufacturing method of the said cutting board provided by this invention can laminate | stack a skin layer efficiently on both surfaces of an intermediate | middle layer. Moreover, when the content of HDPE and / or LLDPE in the intermediate layer is 90% by mass or less, the occurrence of defective products during extrusion lamination is reduced. Therefore, productivity is high.
[Brief description of the drawings]
FIG. 1 is a schematic cross section of an example of a cutting board according to the present invention.
FIG. 2 is a diagram for explaining a configuration of a jig used in an evaluation test for heating warpage.
FIG. 3 is a diagram illustrating a configuration of a jig used in a thermal melting evaluation test.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Intermediate | middle layer 2 (2a, 2b) ... Skin layer 3 ... Sample 4 ... Jig for heating warpage evaluation 5 ... Jig for thermal melting evaluation

Claims (2)

A skin layer made of a polyethylene resin containing 60 to 90% by mass of low density polyethylene (LDPE) is laminated on both surfaces of an intermediate layer made of polyethylene resin containing 10 to 90% by mass of high density polyethylene (HDPE) , The ratio of the thickness (t) of the individual skin layer to the total thickness (T) of the intermediate layer and the skin layer laminated on both surfaces thereof is 0.1 ≦ t / T ≦ 0.3. Cutting board. Co-extrusion or extrusion lamination of a skin layer made of polyethylene resin containing 60 to 90% by mass of low density polyethylene (LDPE) on both sides of an intermediate layer made of polyethylene resin containing 10 to 90% by mass of high density polyethylene (HDPE) The method for producing a cutting board according to claim 1, wherein lamination is performed by a method.

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